The Messenger of Allah ﷺ said, "Caesar will perish, and there will be no Caesar after him, and Khosrau will perish, and there will be no Khosrau after him."
قال ويهلك قيصر فلا قيصر بعده ويهلك كسرى فلا كسرى بعده
Its isnad is sahih. It has previously appeared at 9350/2.